The 31X10.50R15 Nexen Roadian A/T Pro RA8 has a diameter of 30.5", a width of 10.6", mounts on a 15" rim and has 681 revolutions per mile. It, has a max load of 2270 lbs, has a maximum air pressure of 50 psi, a tread depth of 16/32" and should be used on a rim width of 7-9".